1st off, your processor has 533FSB, not 566. If your motherboard says it is 566, there is something wrong (bug or something else) Now, you have an intresting motherboard, it is a PCIe AGP combo board which is definitly bound to have problems. What is your graphics card? Is it AGP or PCIe? Your problem probably lies within your GFX card because of your motherboard.

Yes, it is 506... could that be the problem? because i've been to an Asus Support forum and everyone says to update the BIOS because the motherboard does not recognize the new CPU model, which in this case is: Intel P4 506.

wait, I know the specs, but do you know what the spec # is? (It is on the processor, and on the side of the box) it is either, SL7YU or SL85U or SL8J8. That's what I need, then I can tell you exactly what's wrong